Abstract
Surface integrity in machining of Ti-6Al-4V alloy is important to industrial applications, especially for the aviation industry. In this work, orthogonal machining experiments with different cooling strategies (dry, MQL, cryogenic and hybrid: MQL and cryogenic), were performed on Ti-6Al-4V alloy using different cutting edge radii (5µm and 50µm). Cutting forces, surface roughness, micro-hardness, and grain size on the surface and in the sub-surface layers were analyzed and compared with respect to cutting edge radii and cooling strategies. The deformation layer was characterized in terms of the microstructure evolution and the relationship between the cutting forces, micro-hardness and microstructure evolution for different conditions are established.
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